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/****************************************************************************
* bfs *
* Copyright (C) 2015-2022 Tavian Barnes <tavianator@tavianator.com> *
* *
* Permission to use, copy, modify, and/or distribute this software for any *
* purpose with or without fee is hereby granted. *
* *
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR *
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES *
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN *
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF *
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *
****************************************************************************/
/**
* The expression tree representation.
*/
#ifndef BFS_EXPR_H
#define BFS_EXPR_H
#include "color.h"
#include "eval.h"
#include "stat.h"
#include <stdbool.h>
#include <stddef.h>
#include <sys/types.h>
#include <time.h>
/**
* Integer comparison modes.
*/
enum bfs_int_cmp {
/** Exactly N. */
BFS_INT_EQUAL,
/** Less than N (-N). */
BFS_INT_LESS,
/** Greater than N (+N). */
BFS_INT_GREATER,
};
/**
* Permission comparison modes.
*/
enum bfs_mode_cmp {
/** Mode is an exact match (MODE). */
BFS_MODE_EQUAL,
/** Mode has all these bits (-MODE). */
BFS_MODE_ALL,
/** Mode has any of these bits (/MODE). */
BFS_MODE_ANY,
};
/**
* Possible time units.
*/
enum bfs_time_unit {
/** Seconds. */
BFS_SECONDS,
/** Minutes. */
BFS_MINUTES,
/** Days. */
BFS_DAYS,
};
/**
* Possible file size units.
*/
enum bfs_size_unit {
/** 512-byte blocks. */
BFS_BLOCKS,
/** Single bytes. */
BFS_BYTES,
/** Two-byte words. */
BFS_WORDS,
/** Kibibytes. */
BFS_KB,
/** Mebibytes. */
BFS_MB,
/** Gibibytes. */
BFS_GB,
/** Tebibytes. */
BFS_TB,
/** Pebibytes. */
BFS_PB,
};
/**
* A command line expression.
*/
struct bfs_expr {
/** The function that evaluates this expression. */
bfs_eval_fn *eval_fn;
/** The number of command line arguments for this expression. */
size_t argc;
/** The command line arguments comprising this expression. */
char **argv;
/** The number of files this expression keeps open between evaluations. */
int persistent_fds;
/** The number of files this expression opens during evaluation. */
int ephemeral_fds;
/** Whether this expression has no side effects. */
bool pure;
/** Whether this expression always evaluates to true. */
bool always_true;
/** Whether this expression always evaluates to false. */
bool always_false;
/** Whether this expression doesn't appear on the command line. */
bool synthetic;
/** Estimated cost. */
float cost;
/** Estimated probability of success. */
float probability;
/** Number of times this predicate was evaluated. */
size_t evaluations;
/** Number of times this predicate succeeded. */
size_t successes;
/** Total time spent running this predicate. */
struct timespec elapsed;
/** Auxilliary data for the evaluation function. */
union {
/** Child expressions. */
struct {
/** The left hand side of the expression. */
struct bfs_expr *lhs;
/** The right hand side of the expression. */
struct bfs_expr *rhs;
};
/** Integer comparisons. */
struct {
/** Integer for this comparison. */
long long num;
/** The comparison mode. */
enum bfs_int_cmp int_cmp;
/** Optional extra data. */
union {
/** -size data. */
enum bfs_size_unit size_unit;
/** Timestamp comparison data. */
struct {
/** The stat field to look at. */
enum bfs_stat_field stat_field;
/** The reference time. */
struct timespec reftime;
/** The time unit. */
enum bfs_time_unit time_unit;
};
};
};
/** Printing actions. */
struct {
/** The output stream. */
CFILE *cfile;
/** Optional -printf format. */
struct bfs_printf *printf;
};
/** -exec data. */
struct bfs_exec *exec;
/** -flags data. */
struct {
/** The comparison mode. */
enum bfs_mode_cmp flags_cmp;
/** Flags that should be set. */
unsigned long long set_flags;
/** Flags that should be cleared. */
unsigned long long clear_flags;
};
/** -perm data. */
struct {
/** The comparison mode. */
enum bfs_mode_cmp mode_cmp;
/** Mode to use for files. */
mode_t file_mode;
/** Mode to use for directories (different due to X). */
mode_t dir_mode;
};
/** -regex data. */
struct bfs_regex *regex;
/** -samefile data. */
struct {
/** Device number of the target file. */
dev_t dev;
/** Inode number of the target file. */
ino_t ino;
};
};
};
/** Singleton true expression instance. */
extern struct bfs_expr bfs_true;
/** Singleton false expression instance. */
extern struct bfs_expr bfs_false;
/**
* Create a new expression.
*/
struct bfs_expr *bfs_expr_new(bfs_eval_fn *eval, size_t argc, char **argv);
/**
* @return Whether the expression has child expressions.
*/
bool bfs_expr_has_children(const struct bfs_expr *expr);
/**
* @return Whether expr is known to always quit.
*/
bool bfs_expr_never_returns(const struct bfs_expr *expr);
/**
* @return The result of the integer comparison for this expression.
*/
bool bfs_expr_cmp(const struct bfs_expr *expr, long long n);
/**
* Free an expression tree.
*/
void bfs_expr_free(struct bfs_expr *expr);
#endif // BFS_EXPR_H
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